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Assume you are using passthrough bl heli.
worth reflash FC firmware as BL heli will only see ESC signal wires connected to FC, if same after reflash suspect FC fault.
you could try to remap motor 4 output to another pin if FC trace broken.

Doomed just a thought as dont use all in one ESCs. just for arguments shake lets say the trace on FC bad, surly using BL heli through the FC even if all in one ESC good, the motor will still not spin.
or do all in one ESC have own USB connection?
As i say dont use all in ones so probably a little confusing .

hello!! thanks you all for your answer. they were very helpful. doomed, i dont know what you mean by spining my motors from blheli, since i cant see any feature in blheli configurator app to spin and test the motors.
anyway. something really weird happened. after watching couple videos about how to remap motors from joshua bradwell and blue falcon, i think i succesfully remapped them. soldered motor 4 to motor 5 pad, and then changed tje source. good. i went to try the motors in betaflight and yaay, all 4 motors spinning.
my surprise was that after setting everything (cause i just flashed to latest bf version) like uart 6 for tx. set the ibus input for the transmitter, modes, leds etc etc. it went back to step number one. motor 4 not working (esc recognised this time in blheli, so fc and esc are linked) but no motor spining.
yes, i calibrated esc by pulling the throttle in bf, and then conecting the battery.
i then reflashed to start again, and seems like just after flashing the remapping works, but once i set up the quad something is bad. there mist be something i am missing…
and yes i tried to first se up the quad and then remap, but didnt work.
any ideas guys??
thanks for you time!!!

sorry for the delay. but havent had much time.
anyway forget it. i fixed it already. i dont know exactly what i did right or wrong but now is working.
hehe. so thank you very much people!!!
bad thing is that from soldering and desoldering from the new 4 in 1 esc i dettached one of the copper pads for the motors… and i dont think i will be able to to use it anymore. luckly i had the old one, that worked perfectly.